<html>
  <head>
    <meta content="text/html;charset=utf-8" http-equiv="Content-Type"/>
  </head>
  <body>
    <canvas style="position: absolute;top:0;bottom: 0;left: 0;right: 0;margin:auto;"></canvas>
    <canvas style="position: absolute;top:0;bottom: 0;left: 600;right: 0;margin:auto;"></canvas>
  </body>
</html>
